close tolerance pipe slurrification (ctps) hdd … · back reamer new pipe close fit pipe guide...

CLOSE TOLERANCE PIPE SLURRIFICATION (CTPS)

HDD ASBESTOS CEMENT PIPE REMOVALAND REPLACEMENT

Patent # US 8,641,326 & US 10,557,587

Since 1937 AC Water Mainline Pipe History

AC Water Mainline Pipe History

AC Water Mainline Pipe History

Over 7 years to develop this new HDD method of asbestos pipe removal and replacement

process. Industry name is "Close Tolerance Pipe Slurrification or CTPS. I worked with the US

Environmental Protection Agency for 2.5 years to get full approval. This is the only EPA

approved trenchless method to remove and replace asbestos cement pipes. CTPS uses existing

HDD equipment that can meet the required minimum drill stem rotation speed along with

specially built tooling and a special drilling fluid recipe.

Advantages: no fluid pressure, quick process, upsizing not a problem, existing pipe can be very

shallow without concerns for the surface area, easy process to learn. HDD equipment can be

used for many other applications.

Manufactures Formula That Makes up AC Pipe

•45-55% Portland Cement

•25-35% Silica Flour

•15-25% Chrysotile Asbestos

Close Tolerance HDD AC Pipe Slurrification Process

36 Inch Service Reconnection Pit

Existing Asbestos Cement Pipe

Vertical Slurry Relief Hole for Asbestos Pipe

Removal

Close Tolerance HDD Back Reamer

New Pipe

Close Fit Pipe Guide Head With Pressure

Relief

¼” annular space

Close Tolerance HDD Asbestos Pipe Replacement Back Reamer and Guide Head

Wide Sharp Edge Carbide Cutters Rotating at a minimum240+ RPM’s Creates Slurry and Reactivates Portland Cement

HDD Rig Setup Installing 14” Fusible PVC

HDD Pilot Stem Through 14” AC Pipe and AC Slurry

Asbestos Cement Pipe Slurry

Close Tolerance Pipe Fit No Voids

Close Tolerance Pipe Slurrification Annular Space Information:

The EPA's approval considered the amount of asbestos material

left within the close fit annular space to be a trace and the amount.

The trace material will be encapsulated within

the portland cement and additives.

The amount of asbestos is only considered a trace and can easily

be reduced by turning up the drilling fluid gallons per minute or

by upsizing the pipe by one pipe size.

This is the best estimate of what makes up the quarter inch

annular space around the newly installed pipe.

The annular space information listed below is based on replacing

8 inch AC pipe with 8" DIP fusible HDPE or PVC.

Annular Material Material

Space Fractions What Makes Up The Slurry Material Inches

0.1250 Portland Cement 1/8"

0.250 0.0625 Silica Flour/Sand 1/16"

0.0313 Drilling Fluids & Additional Portland Cement 1/32"

0.0156 Surrounding Soils 1/64"

0.0156 Asbestos 1/64"

For further information contactTrenchless Consulting, LLC

info@trenchlessflowline.com

Ted Dimitroff – President573-268-2294 cell

ted@trenchlessflowline.com

THANK YOU